package com.xunmall.base.util.reflection;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

/**
 * @Author: WangYanjing
 * @Date: 2018/12/27 10:53
 * @Description:
 * 反射工具类.
 * 
 * 提供访问私有变量,获取泛型类型Class, 提取集合中元素的属性, 转换字符串到对象等Util函数.
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public class ReflectionUtils {
    private static Logger logger = LoggerFactory.getLogger(ReflectionUtils.class);
    private static final String CGLIB_CLASS_SEPARATOR = "$$";

    /**
     * 调用Getter方法.
     */
    public static Object invokeGetterMethod(Object obj, String propertyName) {
        String getterMethodName = "get" + StringUtils.capitalize(propertyName);
        return invokeMethod(obj, getterMethodName, new Class[] {}, new Object[] {});
    }

    /**
     * 调用Setter方法.使用value的Class来查找Setter方法.
     */
    public static void invokeSetterMethod(Object obj, String propertyName, Object value) {
        invokeSetterMethod(obj, propertyName, value, null);
    }

    /**
     * 调用Setter方法.
     * 
     * @param propertyType
     *            用于查找Setter方法,为空时使用value的Class替代.
     */
    public static void invokeSetterMethod(Object obj, String propertyName, Object value, Class<?> propertyType) {
        Class<?> type = propertyType != null ? propertyType : value.getClass();
        String setterMethodName = "set" + StringUtils.capitalize(propertyName);
        invokeMethod(obj, setterMethodName, new Class[] { type }, new Object[] { value });
    }

    /**
     * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
     */
    public static Object getFieldValue(final Object obj, final String fieldName) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
        }

        Object result = null;
        try {
            result = field.get(obj);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常{}", e.getMessage());
        }
        return result;
    }

    /**
     * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
     */
    public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
        }

        try {
            Object value2 = value;
            if (field.getType().equals(Long.class) && value.getClass().equals(Integer.class)) {
                value2 = new Long((Integer) value);
            } else if (field.getType().equals(Integer.class) && value.getClass().equals(Long.class)) {
                value2 = new Integer(((Long) value).intValue());
            } else if (field.getType().equals(Boolean.class) && value.getClass().equals(Integer.class)) {
                if ((int) value > 0) {
                    value2 = true;
                } else {
                    value2 = false;
                }
            } else if (field.getType().equals(String.class)) {
                value2 = value.toString();
            }
            field.set(obj, value2);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常:{}", e.getMessage());
        }
    }

    /**
     * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
     * 
     * 如向上转型到Object仍无法找到, 返回null.
     */
    public static Field getAccessibleField(final Object obj, final String fieldName) {
        Assert.notNull(obj, "object不能为空");
        Assert.hasText(fieldName, "fieldName");
        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Field field = superClass.getDeclaredField(fieldName);
                field.setAccessible(true);
                return field;
            } catch (NoSuchFieldException e) {// NOSONAR
                // Field不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    public static Field getAccessibleField(final Class clazz, final String fieldName) {
        Assert.notNull(clazz, "object不能为空");
        Assert.hasText(fieldName, "fieldName");
        for (Class<?> superClass = clazz; superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Field field = superClass.getDeclaredField(fieldName);
                field.setAccessible(true);
                return field;
            } catch (NoSuchFieldException e) {// NOSONAR
                // Field不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 直接调用对象方法, 无视private/protected修饰符. 用于一次性调用的情况.
     */
    public static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes, final Object[] args) {
        Method method = getAccessibleMethod(obj, methodName, parameterTypes);
        if (method == null) {
            throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * 获取类的Method对象
     */

    public static Method getMethod(Class clazz, String name, Class... parameterTypes) {
        Method re = null;
        try {
            re = clazz.getMethod(name, parameterTypes);
        } catch (SecurityException e) {
            return null;
        } catch (NoSuchMethodException e) {
            return null;
        }
        return re;
    }

    /**
     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问. 如向上转型到Object仍无法找到, 返回null.
     * 
     * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
     */
    public static Method getAccessibleMethod(final Object obj, final String methodName, final Class<?>... parameterTypes) {
        Assert.notNull(obj, "object不能为空");

        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Method method = superClass.getDeclaredMethod(methodName, parameterTypes);

                method.setAccessible(true);

                return method;

            } catch (NoSuchMethodException e) {// NOSONAR
                // Method不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    public static Method getAccessibleMethod(final Class clazz, final String methodName, final Class<?>... parameterTypes) {
        Assert.notNull(clazz, "object不能为空");

        for (Class<?> superClass = clazz; superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Method method = superClass.getDeclaredMethod(methodName, parameterTypes);

                method.setAccessible(true);

                return method;

            } catch (NoSuchMethodException e) {// NOSONAR
                // Method不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型. 如无法找到, 返回Object.class. eg. public UserDao extends HibernateDao<User>
     *
     * @param clazz
     *            The class to introspect
     * @return the first generic declaration, or Object.class if cannot be determined
     */
    public static <T> Class<T> getSuperClassGenricType(final Class clazz) {
        return getSuperClassGenricType(clazz, 0);
    }

    /**
     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型. 如无法找到, 返回Object.class.
     * 
     * 如public UserDao extends HibernateDao<User,Long>
     *
     * @param clazz
     *            clazz The class to introspect
     * @param index
     *            the Index of the generic ddeclaration,start from 0.
     * @return the index generic declaration, or Object.class if cannot be determined
     */
    public static Class getSuperClassGenricType(final Class clazz, final int index) {

        Type genType = clazz.getGenericSuperclass();

        if (!(genType instanceof ParameterizedType)) {
            logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
            return Object.class;
        }

        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

        if (index >= params.length || index < 0) {
            logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: " + params.length);
            return Object.class;
        }
        if (!(params[index] instanceof Class)) {
            logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
            return Object.class;
        }

        return (Class) params[index];
    }

    /**
     * 将反射时的checked exception转换为unchecked exception.
     */
    public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
        if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException || e instanceof NoSuchMethodException) {
            return new IllegalArgumentException("Reflection Exception.", e);
        } else if (e instanceof InvocationTargetException) {
            return new RuntimeException("Reflection Exception.", ((InvocationTargetException) e).getTargetException());
        } else if (e instanceof RuntimeException) {
            return (RuntimeException) e;
        }
        return new RuntimeException("Unexpected Checked Exception.", e);
    }

    /**
     * 递归获取类的所有字段
     * 
     * @param clazz
     * @return
     */
    public static Field[] getAllField(Class clazz) {
        Field[] fs = null;
        Field[] fs1 = clazz.getDeclaredFields();
        if (null != clazz.getSuperclass()) {
            Field[] fs2 = getAllField(clazz.getSuperclass());
            fs = new Field[fs1.length + fs2.length];

            System.arraycopy(fs1, 0, fs, 0, fs1.length);
            System.arraycopy(fs2, 0, fs, fs1.length, fs2.length);
        } else {
            return fs1;
        }
        return fs;
    }

    /**
     * 递归获取类的所有方法
     * 
     * @param clazz
     * @return
     */
    public static Method[] getAllMethod(Class clazz) {
        Method[] fs = null;
        Method[] fs1 = clazz.getDeclaredMethods();
        if (null != clazz.getSuperclass()) {
            Method[] fs2 = getAllMethod(clazz.getSuperclass());
            fs = new Method[fs1.length + fs2.length];
            System.arraycopy(fs1, 0, fs, 0, fs1.length);
            System.arraycopy(fs2, 0, fs, fs1.length, fs2.length);
        } else {
            return fs1;
        }
        return fs;
    }

    /**
     * 判断该属性是否为静态属性
     * 
     * @param clazz
     * @param field
     * @return
     * @throws Exception
     */
    public static boolean isStaticField(Class clazz, Field field) throws Exception {
        String fullFieldName = field.toString();
        String specialFieldName = field.getName();
        String typeName = field.getType().getName();
        String filterName = fullFieldName.replaceAll(specialFieldName, "").replaceAll(typeName, "");
        if (filterName.indexOf("static") != -1) {
            return true;
        } else {
            return false;
        }
    }

    public static Class<?> getUserClass(Object instance) {
        if (instance == null) {
            throw new IllegalArgumentException("Instance must not be null");
        }
        Class clazz = instance.getClass();
        if ((clazz != null) && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
            Class<?> superClass = clazz.getSuperclass();
            if ((superClass != null) && !Object.class.equals(superClass)) {
                return superClass;
            }
        }
        return clazz;
    }

}
